Infectious RNA without capsid:
Correct answer: B. Viroid
- A. Virion
- B. Viroid
- C. Prion
- D. Virus
Explanation
The answer is B) viroid. A viroid is a small, infectious RNA molecule that does not have a protein coat (capsid). Viroids are the smallest known infectious agents. They are able to replicate in plants, but they cannot infect animals or humans. A virus is a small, infectious agent that can replicate only inside the living cells of an organism. Viruses can be classified into 3 groups. A prion is a misfolded protein that can transmit its misfoldedness to normal variants of the same protein and trigger cellular death. A virion is a complete virus particle, including the nucleic acid (DNA or RNA) and the protein coat.
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About Biodiversity and Variety of Life
Biological classification uses taxonomic ranks, binomial nomenclature and shared characteristics to organize life into kingdoms. The major groups include prokaryotes, protists, fungi, plants and animals, with comparisons based on cell type, cell wall, nutrition, body organization, reproduction and evolutionary relationships; prokaryotes lack a membrane-bound nucleus.
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